High-Data Density Four-Color Liquid Crystal Display

Robert C. Tsai

doi:10.1117/12.931758

28 July 1981 High-Data Density Four-Color Liquid Crystal Display

Robert C. Tsai

Proceedings Volume 0271, Advances in Display Technology II; (1981) https://doi.org/10.1117/12.931758
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States

Abstract

A very high resolution and high contrast laser addressed liquid crystal color display has been developed for use in the acquisition and exploitation of high density alpha-numeric and graphic data. The display system consists of two smectic liquid crystal light valves (SLCLV) which are thermally addressed by a single laser selectively. Each light valve is capable of generating 2048x2048 addressable pixels within a 1"x1" data format. There are 8x106 pixels available for data presentation. The laser writing system consists of the laser, a modulator which enables the formation of discrete data elements on the SLCLV, a two axis galvanometer deflection unit and beam splitting optics designed to multiplex the writing laser on each SLCLV. A closed-loop galvo deflection system can position the focused laser beam to an accuracy of 0.1% across the screen. Laser focus lens is an f/8.0 telecentric design to produce a 1"x1" data format on the SLCLV with spot size less than .0004". Color images from each light valve are superimposed onto the screen by a wide angle f/8.0 projection lens with 48X magnification relays the combined color image to a 48"x48" screen with less than 0.1% of distortion. The possible contrast of the display is up to 60 to 1. The overall dimension of the rear projected color display is 60"x52"x31".

Citation Download Citation

Robert C. Tsai "High-Data Density Four-Color Liquid Crystal Display", Proc. SPIE 0271, Advances in Display Technology II, (28 July 1981); https://doi.org/10.1117/12.931758

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